Identify the content type before diagnosing the icon
STV describes Picture in Picture as a small continuing video window while the viewer uses another page or application. Its help lists live-stream PiP for Chrome or Safari on the website and for the iOS app. Android is described separately for live and on-demand streams on Android 8 or later. General app availability is therefore not a promise of identical PiP behaviour for every item.
Keep the source player running
On the web, STV says the original page or tab must stay open; the viewer can use another tab or minimise the browser. In the mobile apps, the application remains running in the background. Closing the source tab or force-closing the app is a different action from leaving it available behind the small window.
Use a controlled comparison
For example, if a live stream enters PiP on an iPhone but an on-demand episode does not, compare that result with the published content scope first. Do not conclude that the phone has lost all multitasking support. Conversely, an advertised supported case that closes immediately needs its own report, with the operating system and application version identified.
Separate permission, support and playback questions
Check the device’s applicable PiP controls if needed, but do not expect a permission switch to add a content route the provider does not document. Report whether the icon is absent, the window closes or audio continues without the intended picture. These observations distinguish a feature-scope question from a malfunction. This article describes first-party instructions, without claiming an STV playback test.
Questions, answered
Does STV document the same PiP content scope on iOS and Android?
No. Its published help distinguishes them.
Should the original web tab be closed after opening PiP?
No. STV says to keep it open.